Trailer Tow
WARNING: This page is about a different car, the 2014 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
The Battery Junction Box (BJB) supplies voltage to the trailer tow stop/turn, parking and reversing lamps. When the vehicle's rear stop/turn, parking lamps or reversing are illuminated, voltage is supplied to a corresponding trailer tow relay located in the BJB .
The trailer tow battery charge relay provides voltage to the trailer tow connector when the ignition switch is in run.
The vehicle can be equipped with a factory manufactured Trailer Brake Control (TBC) module. For diagnostic information, refer to AUXILIARY BRAKE SYSTEM .
On vehicles not equipped with a factory manufactured TBC module, the vehicle comes equipped with circuitry to support an aftermarket TBC module.